Core box



April 5, 1932.

C. ALTHAUS CORE BOX Filed April 5, 1930 Patented Apr. 5, 1932 CONRADALTHAUS, or

rarnr OFFICE BELVIDERE, ILLINOIS CORE BOX Application filed April 3,

This invention relates to core boxes, and has more particularly to dowith the production of cores having tapered end portions.

In preparing molds for certain castings having cavities or bores, itis'necessary to provide the molds with cores. In some cases, the coresare usually of the same shape throughout their length, eithercylindrical or otherwise, while in other cases it is necessary to taperthe end portions of the cores.

It is the production of tapered cores that more particularly concernsthe present invention, the principal object of which is to produce corespractically and ei'iiciently, in a simple and economical manner. To thisend the invention consists primarily in the provision of an attachmentfor the ordinary core box whereby the same box that is used forproducing the usual plain cores may be readily adapted for theproduction of tapered cores. The invention further consists in the partsand combinations and arrangements of parts as hereinafter described andset forth in the appended claims.

In the accompanying drawings, illustrating a practical adaptation of theinvention,

Fig. 1 is a perspective view of the assembled core box as equipped withthe taper producing attachments;

Fig. 2 is a perspective view showing the two core box sections separatedand the taper producing attachment removed therefrom;

Fig. 3 is a perspective view of the taper producing attachment detachedfrom the core box and its two half sections separated;

Fig. 4 is a plan view of the end portion of one-half of the core box,with the corresponding half of the taper producing attachment appliedthereto; and

Fig.- 5 is a perspective view of a core as produced from the core boxwith the taper attachment applied.

Referring now to the drawings, wherein a core box is illustrated forproducing a core comprising a generally cylindrical body and tapered endportion, the numeral 6 designates the lower section, and 7 the uppersection of the box, said sections being generally rectangular and havingregistering longitudi- 59 nal grooves 8 and 9, respectively, which pro-1930. Serial No. 441,299.

duce a cylindrical bore when the two sections 6 and 7 are placedtogether. In accordance with the usual practice, one of the core boxsections is provided with tapered dowel pins 10 which entercorresponding apertures provided therefor in the companion section.

Heretofore, when it was desired to taper the end portions of the coresit has been customary to cut off the end portions of the core boxsections proper and attach thereto sections of corresponding dimensionsbut having the grooves corresponding to the grooves 8 and 9 taperedaccording to the degree of the taper it was desired to produce on thecore. By this practice, in addition to difficulty in 05 attaching thecore box extensions endwise to the main body members, and the cost ofproduction incidental thereto, there is the further disadvantage of theexcessive space required for storage purposes, as separate boxes arerequired for producing plain cores and tapered cores of the same length;The present invention, therefore, overcomes the foregoing disadvantagesin that the same core box members 6 and 7 may be used for producing bothplain cores and tapered cores. To this enda split bushing is provided,said bushing comprising the two half sections 11 and 12 which aresemi-cylindrical externally and of the same diameter as the grooves 8and 9 in the box sections 6 and 7, said bushing sections 11 and 12 beingprovided with tapered grooves 13 and 14, respectively, so that when saidsections are assembled and inserted in the end of the core box the borethereof is conically restricted at one end.

The inner end of the bushing is preferably sharpened to a knife edge soas to avoid producing an abrupt shoulder at the base of the tapered endportion of the core, a core as thus as produced being illustrated inFig. 6 and having the cylindrical body portion 15 andtapered end portion16. Preferably, the outer end portions are flanged or attached to plates17 and 18, respectively, which are apertured 65 for the reception ofscrews '19 wherebyv said plates may be detach ably secured to theadjacent end portions of the core box sections 6 and 7 In this way thebushing may be applied to the box and removed therefrom, at

will, and said flanges or plates 17 and 18, in addition to affording ameans of attachment and support for the bushing, serve as a protectionfor the ends of the box sections 6 and 7 and prevent mutilation thereofin the region of the grooves 8 and 9.

The bushing members 11 and 12, of course, are made of metal for strengthand durability, while the box sections 6 and 7 may be made of wood inaccordance with the customary practice, and while the box illustrated isfor the production of cores of cylindrical body and conically taperedend portion, obviously, the box sections and bushing members may be madeto produce cores of other shapes, and the device may be modified inother respects without in the least departing from the spirit and scopeof the invention as defined by the appended claims. The invention,therefore, is not limited to the specific construction and arrangementshown in the accompanying drawings.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. A core box comprising a body portion having a core forming openingtherein to produce cores of a given formation, and a bushing insertablein the end portion of said core forming opening and being internallyformed to correspondingly change the shape of the produced core.

2. A core box comprising mating sections provided with registeringgrooves in their meeting portions to produce an opening for forming acore of a given shape, and a split bushing insertable in the end portionof said core forming opening, said bushing comprising half sectionsconforming externally to the shape of the adjacent fitted portion ofsaid core forming opening and being internally formed to correspondinglychange the shape of the produced core.

3. A core box comprising a body portion having a core forming openingtherethrou'gh whereby to produce a core of given formation, and asupplemental bushing insertable in the end portion of said core formingopening whereby to change the end formation of the produced core, saidbushing corresponding externally to the contour of the adjacent fittedportion of said core forming opening and being inwardly flared, theinner end portion of said bushing terminatingwith a sharp annular edgemerging with the Wall of said core forming opening without producing anabrupt shoulder.

4. A core box comprising mating half sections having registering grooves1n their proper, said bushing being internally tapered and wideninginwardly with a sharp annular terminal edge and having flanged outer endportions detachably secured to the adjacent end portions'of said boxsections proper.

In testimony whereof I have signed my L name to this specification.

CONRAD ALTHAUS.

